The 2020s is the 3rd decade of the 21st century of the Anno Domini (common) era. It will begin on January 1, 2020 and end on December 31, 2029. By the end of the decade, world population is projected to surpass 8 billion people. Notable predictions and known events Solar scientists predict that, by 2020, the sun will be starting into its weakest Schwabe solar cycle of the past two centuries. By mid-decade, Alpine glaciers are likely to contain only half their 1970's volume. NASA expects to l… (More on 2020s)